feat: add auto-update functionality

Makefile

@@ -1,17 +1,23 @@
 .PHONY: dev build clean install frontend
 
+# Get version from git tag
+VERSION := $(shell git describe --tags --always --dirty 2>/dev/null || echo "dev")
+GIT_COMMIT := $(shell git rev-parse --short HEAD 2>/dev/null || echo "unknown")
+BUILD_TIME := $(shell date -u +"%Y-%m-%dT%H:%M:%SZ")
+LDFLAGS := -X 'daily-timer/internal/version.Version=$(VERSION)' -X 'daily-timer/internal/version.GitCommit=$(GIT_COMMIT)' -X 'daily-timer/internal/version.BuildTime=$(BUILD_TIME)'
+
 # Development (fixed ports: Vite 5173, Wails DevServer 34115)
 dev:
 	wails dev -devserver localhost:34115
 
 # Build for macOS
-build:
-	wails build -clean
+build: lint
+	wails build -clean -ldflags "$(LDFLAGS)"
 	@xattr -cr "build/bin/Daily Timer.app" 2>/dev/null || true
 
 # Build for macOS (universal binary)
-build-universal:
-	wails build -clean -platform darwin/universal
+build-universal: lint
+	wails build -clean -platform darwin/universal -ldflags "$(LDFLAGS)"
 	@xattr -cr "build/bin/Daily Timer.app" 2>/dev/null || true
 
 # Install frontend dependencies
@@ -51,13 +57,10 @@ deps:
 init: deps frontend
 	@echo "Project initialized. Run 'make dev' to start development."
 
-# Get version from git tag
-VERSION := $(shell git describe --tags --always --dirty 2>/dev/null || echo "dev")
-
 # Release - build and package
-release:
+release: lint
 	@echo "Building release $(VERSION)..."
-	wails build -clean
+	wails build -clean -ldflags "$(LDFLAGS)"
 	@xattr -cr "build/bin/Daily Timer.app" 2>/dev/null || true
 	@mkdir -p dist
 	cd build/bin && zip -r "../../dist/Daily-Timer-$(VERSION)-macos-arm64.zip" "Daily Timer.app"
@@ -65,7 +68,7 @@ release:
 	@ls -lh dist/*.zip
 
 # Release for both architectures
-release-all:
+release-all: lint
 	@echo "Building release $(VERSION) for all platforms..."
 	@mkdir -p dist
 	GOOS=darwin GOARCH=arm64 wails build -clean -o daily-timer-arm64